I had a similar problem on my Hatz one day. Check your fuel flow. Disconnect at the carburetor and let the fuel run into a container. Check the amount of fuel pumped in a minute by using a stop watch. If you are not getting 40 liter per hour there must be a restriction somewhere. I my case I found dirt in the selector valve.
----- Original Message ----- From: "Mark Moody" <[email protected]> To: <[email protected]> Sent: Tuesday, April 07, 2009 4:39 AM Subject: KR> Temporary partial loss of power ...... I went for a short flight on a clear sunny day with warm temperature and climbed to 3000 feet asl. I was flying for about 20 minutes with the engine sounding fine and then I heard a hiccup and started to play with the mixture and it got better but then all of a sudden I heard another and then another and it seemed that no matter what I did by either leaning or richening the mixture it didn't make a difference. I tried the carb heat for a while with no difference. .......
